Give one word or term for the following descriptions:
The process during which ammonium chloride changes from a solid to a gas when it is heated.

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Solution

Sublimation is the process in which there is a change of state directly from solid to a gas without changing into a liquid state.
Example: Iodine crystals when heated at $100^{o} C$ turns directly into gas.
Thus, sublimation is the process during which when ammonium chloride changes from a solid to a gas when it is heated.

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Question 30
Which among the following are physical or chemical changes?

(a) Evaporation of petrol.

(b) Burning of Liquefied Petroleum Gas (LPG).

(d) Curdling of milk.

(e) Sublimation of solid ammonium chloride.

In the following question, two statements are given -- one labelled Assertion (A) and the other labelled Reason (R). 1

Assertion: Ammonium chloride changes its state when heated.

Reason: Ammonium chloride undergoes sublimation.

Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:

Give one word or term for the following descriptions:

The amount of heat required to change $1 k g$ of a solid into a liquid state.

Ammonia gas is produced when solid Ammonium Chloride is heated with

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